Stove



Nov. 19, 1940. B. B. KAHN ET AL STOVE Filed June 20 ATTORNEYS PatentedNov. l9, 1940 PATENT OFFICE STOVE Bertrand B. Kahn, Cincinnati, and CarlJ. Hake, Hamilton, Ohio, assignors to The Estate Stove Company,Hamilton, Ohio, a corporation of Ohio I Application June 20, 1938,Serial No. 214,700

7 Claims. (Cl. 219-37) This invention relates to stoves and moreparticularly to a cooking range.

A primary object of the invention is to provide a cooking range having acooking griddle 6 upon the cooking top of the stove with a coverlidadapted to be moved into and away from a concealing position overlyingthe griddle and protected so that the heating unit cannot be operatedwhen the cover is in lowered position.

10 It is a further oble t to provide a'stove having a broiler compartm tand an automatically acting control for limitingthe maximum temperaturecondition within the compartment and preventing overheating thereof. I

15 It is a further object to provide a stove having anupper exposedcooking griddle and a broiler compartment both heated from the samesource with a cover adapted to overlie the cooking griddie and in whichthe heating source is turned- 20 oil either when the cover is lowered orwhen the temperature within the compartment exceeds a desired maximum.

Itis a still further object to provide in a stove out this character asingle cut-oil means arranged 25 to be actuated in response to both thelowering of said cover and the existence of a temperature within thecompartment in excess of the desired maximum to deenergiie the heatingelement.

Other objects and advantages will be apparent v 30 from the followingdescription, the a pended claims, and the accompanying drawing, inwhich: Fig. 1 is a sectional 'view, partly in elevation, through thebroiler compartment and griddle plate of an electric range constructedin accord- 35 ance with the present invention;

I Fig. 2 is a front elevation of the switch means illustrated in Fig. 1;and a Fig. 3 is a diagrammatic view of the control circuit for thecombined broiler and griddle plate 40 heating unit.

Referring to the drawing which illustrates a preferred embodiment of theinvention in which like reference-characters designate like parts in theseveral views, the stove Ill, only a portion of 45 which is illustrated,is shown as comprising a,

broiler compartment ll having an electrical heating unit in the upperportion thereof and a removable griddle plate It positioned above thebroiler compartment adjacent the heating unit 0 therein. The heatingunit is supported from the framework of the stove by any desired meanssuch as the insulated hangers l4 and an opening is provided in the topof the stove over the broiler compartment to permit the griddle plate tobe 55 heated by direct radiation from the heating unit lmarginaldepression or groove it which serves to trap grease or the like and toposition the griddle within the opening provided above the broilercompartment. The same heating element thus provides for heating both thebroiler compartment and the griddle. 1 I

The broiler compartment is provided with a drawer-like member 20 and afront closure 2| which is pivotally' connected to the member 20 at thefront portion of the stove as indicated at 22. The front closure 2| isnormally latched in a vertical position as indicated at 23 but may beswung to a horizontal position by lifting upwardly on the closure andreleasing the latch from a pin 23 carried by the member 2|! adjacent theforward end thereof. stop pin 24 limits rotation of the front closureabout the pivot 22. The

.member 20 is adapted to slide into and out of the compartment II bymeans of a handle, not shown, attached to the front closure 2| and isguided in such movement by the rollers 2! and 26. The rollers 25 aresupported from the bottom of the broiler compartment by means of abracket 21 and is adapted to ride on outturned'ilanges 28 provided oneach side of the member 20 at the g top portion thereof. The rollers 26are carried by the member 20 at the lower rear portion thereof and ridewithin the upper and lower tracks 29 and 30 supported adjacent each sideof the broiler compartment by means of the brackets 3| and 21. Stops 32carried by the upper tracks 29 adjacent the front portion of the broilercompartment normally prevent complete withdrawal of the drawer member20. The upper tracks 29 and stops 32, however, extend a greater distancetowards the front of the compartment than do the lower tracks 30so-thatby tilting the drawer member 20 the rollers 26 may bedisengagedfrom the stop members and the drawer member completely withdrawn. Thesidewalls of the drawer member 2| are provided with the ribs 33 or thelike for supporting a broiler pan at various distances from the heatingunit. Suitable insulating material 34 such as rock wool or the like isprovided on all sides of the broiler compartment except at the openingbelow the griddle plate l3. The construction of broiler drawer shown isfor illustrative purposes and other suitable broiler supporting meansmay also be used. I

A coverlid 40 is hingedly mounted on the frame structure of the stove asindicated at 4| and is adapted in its closed position to overlie andconceal the griddle plate It. The coverlid ll preferably comprises acontinuous suitably decorated 6 metal sheet, and serves to give thestove a neat andattractive appearance and to keep the suriaceoi' thegriddle clean when not in use. When it is desired to use the griddleplate or the broiler the coverlid is swung to a substantially verticalposition whereJt rests against the mantel back I! of the stove.

In order to prevent energimtion of the heating unit I! when the coverlid40 is in a closed position with resulting damage to the cover. thestoveis provided with a cut-out switch which sheets the opening of thecircuit to the heating unit when the lid is in a closed position andpermits the circuit to be closed when the lid is raised to its openposition. As will be evident from the m circuit diagram of' Fig. 3 theswitch means 45 is in addition to the manual control switch 46 whichlatter is provided to control operation of the heating unit as desired.The heating unit I! is illustrated as being connected to a conventional,three-wire supply system and is provided with a central tap 41 adaptedto be connected to the central or neutral wire of the power system. Theswitch ll is connected in the control circuit for the'heatingunitbetween the terminal block u c! the unit and the manual control switchit and when operated to its open position" breaks the circuit in the twooutside wires to I prevent energization of the heating unit even thoughthe manual control switch 40 is operatedflinthetopplateoithestoveinpositiontobe' operatively engaged by theportion oi the hinge member II which is attached to the .coveriid whenthe lid is swung to its closed position. The switch is mounted on therear wall of the broiler l0 compartment by means or a bracket llprovided with opening I! adapted to receive a bolt or the like andsecure the bracket to the stove wall. A contact assembly plate 83 ofsuitable insulating material is carried by the bracket at substanlltially right angles to the rear wall 01' the broiler compartment andcarries two pairs of binding posts It and it or the like and two pairsoi cooperating contact points it and II. as shown in Fig. 3 the bindingposts 54 are adapted to be connected to the two outside wires of thecontrol circuit which lead to the manual control switch and the powerlines, and the binding posts It are connected to the terminal block 48of the heating unit.

.8 The binding posts II extend to the underside of the contact assemblyplate 53 and carry the fixed contact points it in electrical contacttherewith. 'The binding posts It also extend to the underside of theplate It and clamp a pair of resilient 1o spring members It to theunderside of the plate.

Hie spring members it carry the movable contacts I1 in cooperatingrelation to the nxed contacts l6 and are in electrical contact with therespective binding posts It. The spring memgg bers It are so constructedas to normally tend o coverlid upon closing movement thereof.

open the contacts 50-" and provide a spacing therebetween. In order toeflect a closing of the contacts the tree ends oi the two spring membersI. are fastened to a cross bar I. which is made of suitable insulatingmaterial and is pro- 5 vided with an aperture Cl intermediate the twospring members. A plunger housing Ii is carried by the plate It inalignment with the aperture i0 and extends upwardly from the plate.

-The housing I is suitably recessed to slidably 10 receive an operatingplunger '2 provided with an enlarged head It and a lower portion ofreduced diameter it which passes downwardly through the plate 53 and theaperture Q0 of the cross bar 5!. The plunger 82 passes freely throughthe i5 aperture 60 and is provided below the cross bar 59 with suitablemeans such as the washer I and cotter pin I tocause lilting oi the barI! and simultaneous closing of the contacts "-41 upon upward movement orthe plunger.

A spring 61 seated within the recessed portion of the plunger housing OIengages the enlarged head It oi the plunger t2 and urges the plungerupwardly to cause lifting of the cross bar ll and closing or thecontacts IHI. The spring 81 is 01' suiilcient strength to liit theplunger 82 and cross bar it into the contact closing position againstthe action oi the spring members II which tend to cause opening of thecontacts. Thus the contacts "-41 are normally main- 80 tained closed bythe spring l1. When, however, the plunger 82 is mechanically depressedagainst the action of the spring II, the cross bar It can move to alower position and the spring members It cause the contacts to open.Upon release at the mechanical pressure upon the plunger the spring 61causes the contacts to move to the closed position.

The operating plunger 02 is adapted to be mechanically depressed bymeans oi the operating pin to which extends upwardly through the stovetop and is engaged by the coverlid when the coverlid is moved to itsclosed position. For this purpose the lower end or the operating pin-lland the upper end of the plunger '2 are connected together by means or arigid substantially U-shaped bracket 8 having the lower arm thereofattached to the plunger 2 by suitable means such as the nut II and theupper arm attachedtothepinlll bymeansoinuts "which to thread on thelower portion of the pin it and clamp the pin to the bracket. The nutsI. provide an attachment which permits vertical adiustment of theoperating pin Ill. when the coverlid is in the raised position thespring I which lifts the plunger is and causes the contacts il-ll toclose also raises the operating pin into a position ,above the top ofthe stove in which it will be engaged and depressed by the co pressionoi the pin 80 by the coverlid causes the plunger 02 to be mechanicallydepressed against the action of spring 01 to open the contacts 56-". Itwill thus be evident that whenever the coverlid is in the closedposition the contacts 5 Iii-I1 oiswitchmeansllwillbeopenandpreventenergization oi the heating unit whereas raising of the coverlid causesclosing of the contacts and permits operation of the heating unit undercontrol of the manual switch I.

Notonlyisitdesiredtoprovideagainstsuch operational the heating unit asto cause damagetothecoverlid.butitisalsodesiredtopreventsuchoperationastocausedamagetothe broiler. compartment and other'j-parts oithe q stove by development of an abnormally high temperature conditiontherein. Where cooking operations are being conducted either on thegriddle or within the broiler compartment, such operations absorb heatand are normally completed in a relatively brief period of time suchthat no damaging temperature condition is developed in the compartment.However when no cooking is in progress or when ioodstulf is allowed torem m" in the heating zone for an excessively long period of time, thetemperature therein may rise to such degree as to cause damage. Inaccordance with the invention the switch means is also provided with ameans for opening the contacts Ii-51 to cause deenergization of theheating unit in the event that the temperature within the broilercompartment becomes excessively high. For this purpose the insulation 34adjacent the rear wall 14 of the broiler compartment is provided with 'arecess or well 15, and a heat responsive device adapted to mechanicallydepress the plunger I2 is mounted within this well and though spacedfrom the interior of the broiler compartmentis in heat transferrelationship therewith, the wall hi of the well providing a thermal lagin the response which the temperature sensitive element makes to thetemperature within the broiler. This thermal lag is desirable to avoidpremature deenerend of the plunger 62.

' and upwardly upon cooling thereof.

ing screw 80 is attached to the end '18 of thegization of the heatingelement during the hor mal course of a cooking operation while providing for proper response of the thermal sensitive device to an abnormaltemperature condition continuing for such period of time as bimetallicstrip'by means of nuts ti and is adapted to engage the upper end of theplunger 62 and depress the plunger upon a predetermined downwardmovementoi the free end oi the himetallic strip. The screw 80 and theupper end of the plunger 82 are normally spaced apart by a distancesuillcient to permit operation of the broiler within the desired normaltemperature range without any contact being made between the screw andthe plunger. when, however, the

temperature .of the broiler compartment rises above a predeterminedlimit, of the order of 650 F. for example, the screw engages the top. ofthe plunger 62 and any further rise in temperature of .the broilercompartment will cause the bimetallic strip to depress the plunger,thereby opening the contacts F5! and causing deenergization of theheatiiig Upon cooling;: of the broiler'compartment below this desiredmaximum value following deenergization of the heating unit the end 18 ofthe bimetallic strip-will rise and when the temperature has fallen asuitable amount, of the order of 50 for example, the contacts 50II willagain close and permit energization of the heating unit. Thus when thecoverlid M is in the open position. and the manual control switch 46 ismoved ,to an on position to energize the heating unit ii the bimetallicstrip ll provides a means for and away from said heating plate andadapted automatically opening the circuit to the heating element whenthe. temperature of the broiler compartment rises above a desiredpredetermined limit and for automatically closing the circuit when thetemperature falls below this 5 limit. By adjusting the vertical positionof the screw 80 the normal spacing between the screw and the top of theplunger 62 may be varied to control and select the predetermined temperature limit at which the bimetallic strip operates to deenergize theheating unit.

While the form of apparatus herein described. constitutes a preferredembodiment of the invention, it is to be understood that the inventionis not limited to this precise form of apparatus, and that changes maybe made therein without departing fr m the scope of the invention whichis defined n the appended claims.

What is claimed is? l. in a stove of the character described, a heatingcompartment, heating means for said compartment, a heating plateoverlying compartment and adapted to be heated by said heating means, acoverlid mounted on said stove for movement towards and away from saidheat ing plate and adapted in its closed to overlie the heating plate, acut-oh means he an off position providing for terminating operation ofsaid heating means and. on position permitting operation oi the means,means operable by movement of coverlid towards said closed positiorectuat= said cut-oil means to said off position to prevent operation ofsaid heating means when. said coverlid is in said closed position, meansa responsive to a predetermined temperature within said heatingcompartment for actiia said cut-off means to said of! position to provent overheating of said compartment by heating means rupon operationthereof, and

in' its closed position to overlie the heat;

cut-off means having an Off positrr viding for terminating the operationof said heating means and an on" position permitting operation of theheating means, means normally biasing said cut-off means to said onposition, means engaged by said coverlid upon movement towards saidclosed position to actuate said outoff means to said oil? position, andmeans re sponsive to the temperature of said compartment for actuatingsaid cut-off means to said OE and on positions in response topredetermined tem-= perature conditions in the compartment. I

3. In an electric stove of the character described, a heatingcompartment, a broiler heating means positioned. in an upper portion ofsaid compartment and normally adapted to provide a high temperature zoneat said upper portion of the compartment, a griddle plate mounted abovesaid broiler heating means and adapted to be heated thereby, and meansfor protecting said compartment from excessive temperatures comprising alayer of heat insulating material. positioned within said stove on theexterior of wall of said heating compartment, said layer of in plate,

so movement towards and well extending therethrough adjacent the upperportion oi said compartment and said heating means, switch meansconnected in the circuit 5 oi said heating means and positioned in saidstove in'a zone outside oi said high temperature none and separated iromsaid compartment and said heating means by said layer oi insulatingmaterial, and temperature responsive means 1o mounted outwardly oi saidheat insulating layer and including a bimetallic strip extending intosaid well to a zone normally subjected to the high temperatureconditions oi said high temperature zone ior ei'iecting opening andclosing .5 oi said switch means in response to predetermined temperatureconditions within said heating compartment, said wall oi the heatingcompartment providing a shield between the interior oi said heatingcompartment and said bimetallic 2o strip to protect said strip fromdirect radiation irom said heating means and provide a thermal lag inthe heat transfer thereto.

4. In an electric stove oi the character described, an insulated heatingcompartment prozgvidedwitharecessinawalloitheinsulation thereoi. heatingmeans ior said compartment. a heatin plate overlying said heatingcompartment and adapted to be heated by said heating means, a coverlidmounted on said stove ior away irom said heating plate and adapted tooverlie the heating plate in its closed position. normally closed switchineam supported in said stove adjacent said recess'and adapted to openand close the circuit oi said heating means. meansadapted to be operatedby said coverlid upon movement towards its closed position to causeopening oi said switch means. temperature responsive means positionedwithin said recess and adapted to cause opening and closing oisaid'switch means in respome to predetermined temperature conditionswithin said heating compartment, and means providing a shield betweenthe interior of said heating compartment' and said temperatureresponsive means u to cause a thermal lag in the heattransiertherebetween.

5. In an electric stays of the character described, an insulated heatingcompartment providedwitharecessinawalloitheinsulation' a thereoi,heating means ior said compartment. a

heating plate overlying said heating compartmentandadaptedtobeheatedbysaidheating means. a coverlid moimted on-said stoveior movement towards and away irom said heating plate and'adapted tooverlie the heating plate in its closed position, switch contact meansposiposition. switch contact means positioned in said stoveadiacentsaidrecessandconnectedinthe circuit oi said heating means, anoperating memberadaptedtocauseopeningandclosingoisaid switch contactmeans, spring means normally urging said switch contact means towaqisthe closed position, means connected to said operating member andengaged by said coverlid upon movement towards said closed position tocause opening oi said switch contact means when the coverlid is in theclosed position, and temperature responsive means positioned within saidrecess and adapted to engage said operating member to cause opening'andclosing oi said switch contact means in response to predeterminedtemperature conditions within said heating compartment. said temperatureresponsive means comprising a bimetallic striprigldlyco atone endtosaidwall oi the heating compartment and having its other end overlying saidoperating member in normally spaced relation thereto. means on saidother end' oi'said bimetallic strip ior engaging said member uponpredetermined heating oi said bimetallic strip, and means ior varyingthe normal spacing between said member and the engaging means carried bysaid bimetallic strip.

'I.Inastoveoithecharacterdeaeribed.a heating compartment; heating meansior said compartment mounted in the upper portion thereoi. a heatingplate overlying said compartmentandadaptedtobeheatedbysaidheating means.a coverlid mounted on said stove ior movement towards and away irom saidheating plate and adapted in its closed position to overlie the heatingplate. and means ior protecting said coverlid irom overheating when insaid closed position and ior protecting said compartment iromoverheating upon operation oi said heating means with the coverlid inopen position comprising a cut-oi! means having an oil positionproviding ior terminating the operation oi said heating means and an"on" position permitting operation 'oi the heating means. means operableupon movement oi said coverlid towards said closed position ioractuating said cut-oi! means to said "oi!" position to prevent operationoi heating means with the coverlid in closed position, and meansresponsive to the temperature oi said compartment ior eiiectingoperation oi said out-oi! means tosaid "oi!"- position upon thetemperature oi the compartment rising above 9 a predetermined limit.

- BERTRAND B. KAHN.

CARL J. BAKE.

